Guide-pulley.



Patented Aug. l, |899.

J. H. FLYNN.

GUIDE PULLEV.

(Appumm med am. no, 1an.)

um noden.)

A UNITED rSTA'r-:s

PATENT JOHN II. Y'FLYNN, OF CINCINNATI, OHIO.

SPECIFICATIN forming part of Letters Patent No. 629,899, dated August 1, 199e. Application met nach 29, 1399. serai No. 719.873. (No moan.)

To all whom may concern:

Beit known that I, JOHN H. FLYNN, a citizen of the United States, and a resident of Cincinnati,-Hamilton county, State of Ohio,

have invented certain new and useful Improvements in Guide-Pulleys for Angular- Belt Transmission; and I do declare the following to be a clear, full, and exact description of theinvention,such as will enable others skilled in the art to which it appertains' tol make and use the same, attention being called to the accompanying drawings, with the reference-numerals marked thereomwhich form a part of this specification.

This invention relates to means for snp` porting pulleys used as guide-pulleys to guide belts where the transmission of power by them from one shaft to anotheris at an angle and where the belt operates in conjunction with so-called speed-cones. Theselatter consistof a numberoffpulleys side by side, but of dierent diameters, so that as the belt is shifted from one to the other a variable speed may be had. Then so changing the speed by adjusting the position of the belt from one set of pulleys to another, it is evident that the guide-pulleys supporting the beltin its angular position must also be adjusted to meet the new position of the belt. This adjustment must be further. such as to preserve the proper tension of the belt, and

.if such should be lost special means permitting additionaladjustmen-t must be provided to permit the tension'to berestored. My invention contemplates a construction whereby these guide-pulleys are supported in such a manner that their adjustment to a new position is always correct, in this way thatit also embraces maintenance of the proper tension in the new position, and therefore the adj ust- A mentof this latter requires no special atten- Uff tion.

My inventionfis applicable in all cases` where power is transmitted by belts atan angle and where the driver and the driven pulleys consist of speed-cones. Forthe purpose of explaining it I have shownmy invention in connection with a drill-press, to which it is applied merely and no parts of which are considered as new. L

In the following specification, and particu- `with my invention.

Figures l and 2 show, respectively, a sideand a rear elevation of a drill-press provided Fig. 3 shows a detached detail view of the support for the guide-pulleys.

` 5 is the counter-shaft, being provided with tight and loosepulleys 6 and 7, respectively, the former for driving the shaft, which has also mounted on it a speed-cone, consisting of pulleys 8, 9, and l0, from either one of which, by means of a belt ll, motion is transmitted to a similar speed-cone, consisting of pulleys l2, 13, and let, mounted on the drill-spindle l5,for the purpose of driving the same. Since this latter and the counter-shaft are supported at an angle to each other, it becomes necessary that the belt transmit the power accordingly,-f0r which purpose it is also arranged at an angle,which is done by means of guidepulleys 16. There are two of ihem-onefor each branch of the beltand theyare loosely supported on 'stud-shafts 17, projecting one from each side of a bearing l8. This latter is supported on an inclined bracket 19, secured..i n the present case to the machineframe-that is,to the column of the drill. The manner of supporting bearing 18 is such as to permit itto slide freely on the inclined projccting part of the bracket. When'th belt is shifted from one set of. pulleysuto another, the bearing carrying the guide-pulleys is simply inovedup or down on the inclined part of bracket `19. Supporting the guide-` pulleysin thismanner-that is,v so that during adjustment they move on an inclined plane-has the additional edect of maintaining always the tension of the belt while being shifted fromone position to another.

This is by reason'of the inclined part of thebracket changing the positionof the guidepulleys `at once. in two planesthat is, vertically as well as horizontallyso that the slack which would result if only adjusted in one plane is immediateiy taken up by the simulta-y neous adjustment in the other plane. Thus,

for instance, referring to Fig. 1, where the belt is shown as engaging the uppermost pulley on the spindle, if the guide-pulleys were merely lowered straight down for shifting the belt to engage one of the lower pulleys such lowering would immediately slacken the upright portion of the belt and render further transmission of power impossible. By adjusting, however, the support of the guide-pulleys in the 'manner shown-that is, on an inclined line-whereby it is not merely lowered, but also changed in position horizontally, the change in thislatter direction compensates at once for the slack which would otherwise result from changing the position merely vertically, so that the tension of the belt remains unaffected and requires no further attention. By reason of the strain of the belt engaging the guide-pulleys equally horizontally as well as vertically and centrally opposite their support the mean resultant of this strain acts against the inclined portion of bracket 19, and thereby causes bearing 1S to readily find its proper position between the two strains automatically, and in which position' it also remains without any locking means. Since this adjustment would, however, not in all cases be prompt nor accurate, it is preferable to move the support to its intendedposition. To indicate this latter, I provide suitable marks or depressions, preferably in shape of sockets 21, one for each of the positions which the pulleys may occupy, (see dotted lines,) and which sockets are to be engaged by a member connected to the slidable bearing. In this case I use a locking-pin 22, projecting from a hand-lever 23, pivoted to bearing 18. As shown, the inclination of the bracket is at an angle of forty-five degrees, since the belts transmit at a right angle. My invention may, however, be also used where the belts transmit at an angle other than a right one, and

, therefore to include all such cases the rule may be stated to be that the guide-pulleys should be adjustable on a line the direction of which is such as to be at right angles to a line which bisects the angle under which the belt operates. The position ofy the guide-pulleys changes also laterallythat is,sometimes they are closer together-according to tlie size of the pulley which the belt engages. This adjustment is,however,accomplished entirely by the belt itself and by means of the flanges projecting from the guide-pulleys, which latter are capable for such purpose of sliding` on their shafts 17.

Having described my invention, I claim as new- 1. A bearing for guide-pulleys used in angular belttransmission and means on which it is adjustably supported, the supportingsurface on which such adjustment takes place, being disposed at right angles to a line which bisects the angle under which the belt operates.

2. The combination of two shafts supported at an angle, a speedcone on each, a belt for transmitting motion from one shaft to the other, guide-pulleys to sustain the belt at the requisite angle and an inclined bracket supported between the two shafts which carry the guide-pulleys they being capable of a sliding adjustment thereon. I

3. The combination of guide-pulleys used in angular belt transmission shafts on which they are loosely mounted and an inclined bracket on which these pulleys and their shafts are carried in a manner to be'capable of a sliding adjustment thereon.

4. The combination of guide-pulleys sustaining belts which transmit at an angle, shafts on which they are loosely mounted, a sliding bearing from which these shafts project and an inclined bracket which supports this bearing.

5. Guide-pulleys which sustain belts transmitted at an angle, shafts on which they are loosely mounted, a sliding bearing from which these shafts project, an inclined bracket which supports this bearing and means to lock this latter to the former.

6. The combination of a machine-frame, two shafts supported ata right angle, a speedcone on each, a belt to transmit .motion from one to the other, guide-pulleys to sustain the belt in its angular position and an inclined bracket projecting from the machine-frame at an angle of forty-five degrees on which these guide-pulleys are adjustably supported.

7. The combination ofan inclined bracket 19, a sliding bearing 18 adjustably mounted thereon, shafts 17 projecting from each side thereof and belt guide pulleys mounted. loosely on these shafts in a manner to .be capable of a longitudinal adjustment thereon. In testimony whereof I hereunto set .my hand in presence of two witnesses.

JOHN H. FLYNN.

lVitnesses:

H. EvERsMANN, C. SPENGEL.

IOO

IOS 

